UIScrollView视图端口坐标

Question

这就是我在UIScrollView

中添加viewDidLoad的方法

    UIScrollView* scrollView = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height)]; 
scrollView.backgroundColor = [UIColor redColor]; 
scrollView.scrollEnabled = YES; 
scrollView.pagingEnabled = YES; 
scrollView.showsVerticalScrollIndicator = YES; 
scrollView.showsHorizontalScrollIndicator = YES; 
scrollView.contentSize = CGSizeMake(self.view.bounds.size.width , self.view.bounds.size.height * 2); 
[self.view addSubview:scrollView]; 
scrollView.delegate = self;

第一次加载scrollView时，它的坐标为：{(0,0), (widthOfiPhone, 0), (0, heightOfiPhone), (widthOfiPhone, heightOfiPhone)}

每当滚动完成，我想在scrollview中获得视口的坐标。这该怎么做？感谢

编辑：

图片来源：https://oleb.net/blog/2014/04/understanding-uiscrollview/

Answer 1

您可以实施UIScrollView delegate方法来检测滚动结束的时间：scrollViewDidEndDecelerating，在此方法中，您可以获得scrollview及content的坐标。顺便说一句content's cooridinate与尊重scrollview !!!相同！

您可以从滚动视图中获取visible rect，

  CGRect visibleRect = [subViewOfScrollView convertRect:subViewOfScrollView.bounds toView:self.view];

Answer 2

首先，观察scrollview代理，然后实现其代理方法

(void) scrollViewDidEndDecelerating: (UIScrollView *) scrollView {
    NSLog (@ "% f,% f,% f,% f", scrollView.frame.origin.x,
    scrollView.frame.origin.y,
    scrollView.frame.size.width,
    scrollView.frame.size.height);
}

这应该是可能的